Question

Alveoli have thin or thick walls???

Answer 1

Answer:

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Explanation:

Each alveolus is cup-shaped with very thin walls. It's surrounded by networks of blood vessels called capillaries that also have thin walls. The oxygen you breathe in diffuses through the alveoli and the capillaries into the blood.

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Answer 2

Answer:

Thin walls.

Explanation:

Alveolar walls are one cell thick providing gases with a short diffusion distance. Moist walls - gases dissolve in the moisture helping them to pass across the gas exchange surface.